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Title:
ANALOG ELECTRONIC WATCH
Document Type and Number:
Japanese Patent JPS54136875
Kind Code:
A
Abstract:

PURPOSE: To realize precise time measurement by an analog electronic watch, by counting the unit time less than a second by means of a counter and driving the hands.

CONSTITUTION: A divide-down output of a frequency divider 5a through a gate 15 which opens according to the start command from a stopwatch is applied to a driving circuit 8a by way of a frequency divider 5b and a counter 6a, and the second hand is driven through a motor 9a until the gate 15 is closed by a measurement end command. On the other hand, by this end command, an AND gate 25 opens, and when the counting of a counter 6b of dividing pulses in the units less than a second, such as 1/100 second, of a frequency divider 5c similar to the frequency divider 5b conincides with the counting of the counter 6a of the dividing pulses in the units such as 1/100 second at the time of the measurement end, a motor 9b turns according to the counting of the counter 6a through a judging circuit 7, so that the hand for displaying less than a second is driven. Therefore, an analog electronic watch capable of displaying less than a second correctly and easily may be obtained.


Inventors:
MINOWA YOSHIKI
Application Number:
JP1978000044976
Publication Date:
October 24, 1979
Filing Date:
April 17, 1978
Export Citation:
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Assignee:
SUWA SEIKOSHA KK
International Classes:
G04C3/00; G04C3/14; G04F8/00; G04F8/02; (IPC1-7): G04C3/00; G04F10/04
Domestic Patent References:
JPS5452578A1979-04-25



 
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